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Some numbers crunchers note that a change in how such deaths are reported also may be a factor.
"Those of us who look at this a lot say it's probably a little bit of both," said Dr. Jeffrey King, an obstetrician who led a recent New York state review of maternal deaths.
The U.S. maternal mortality rate rose to 13 deaths per 100,000 live births in 2004, according to statistics released this week by the National Center for Health Statistics.
The rate was 12 per 100,000 live births in 2003 -- the first time the maternal death rate rose above 10 since 1977.
To be sure, death from childbirth remains fairly rare in the United States. The death of infants is much more common -- the nation's infant mortality rate was 679 per 100,000 live births in 2004.
Maternal deaths were a much more common tragedy long ago. Nearly one in every 100 live births resulted in a mother's death as recently as 90 years ago.
But the fact that maternal deaths are rising at all these days is shocking, said Tim Davis, a Virginia man whose wife, Elizabeth, died after childbirth in 2000.
"The hardest thing to understand is how in this day and age, in a modern hospital with doctors and nurses, that somebody can just die like that," he said.
Some health statisticians note the total number of maternal deaths -- still fewer than 600 each year -- is small. It's so small that 50 to 100 extra deaths could raise the rate, said Donna Hoyert, a health scientist with the National Center for Health Statistics. The rate is the number of deaths per 100,000 live births.
In 2003, there was a change in death certificate questions in the nation's most populous state, California, as well as Montana and Idaho. That may have resulted in more deaths being linked to childbirth -- enough to push up the 2003 rate, Hoyert said.
Some researchers point to the rising C-section rate, now 29 percent of all births -- far higher than what public health experts say is appropriate. Like other surgeries, Caesareans come with risks related to anesthesia, infections and blood clots.
"There's an inherent risk to C-sections," said Dr. Elliott Main, who co-chairs a panel reviewing obstetrics care in California. "As you do thousands and thousands of them, there's going to be a price."
Excessive bleeding is one of the leading causes of pregnancy-related death, and women with several previous C-sections are at especially high risk, according to a review of maternal deaths in New York. Blood vessel blockages and infections are among the other leading causes.
Experts also say obesity may be a factor. Heavier women are more prone to diabetes and other complications, and they may have excess tissue and larger babies that make a vaginal delivery more problematic. That can lead to more C-sections. "It becomes this sort of snowball effect," said King, who is now medical director of maternal-fetal medicine at Riverside Methodist Hospital in Columbus, Ohio.
The age of mothers could be a factor, too. More women are giving birth in their late 30s and 40s, when complications risks are greater.
Other characteristics of the maternal mortality rate include:
â€¢ Race: Studies have found that the maternal death rate in black women is at least three times greater than it is for whites. Black women are more susceptible to complications like high blood pressure and are more likely to get inadequate prenatal care.
â€¢ Quality of care: Three different studies indicate at least 40 percent of maternal deaths could have been prevented.
Sometimes, there is no clear explanation for a woman's death.
Valerie Scythes, a 35-year-old elementary schoolteacher, died in March at a hospital in New Jersey -- the state with the highest Caesarean section rate. She had had a C-section, as did another teacher at the same school who died after giving birth at the same hospital two weeks later.
However, Scythes died of a blocked blood vessel and the other woman died from bleeding, said John Baldante, a Philadelphia, Pennsylvania, attorney investigating the death for Scythes' family.
"I'm not sure there was any connection between the two deaths," Baldante said.
Also mysterious was the death of Tim Davis' 37-year-old wife, Elizabeth, who died a day after a vaginal delivery at a Danville, Virginia, hospital in September 2000.
She had a heart attack after a massive blood loss, Davis said. It's not clearly known what caused the heavy bleeding. There was no autopsy, he said, a decision he now regrets.
Two previous births had gone well.
"Nothing led us to believe anything was wrong with this pregnancy. She was like a picture of health," he continued, noting she had been a YMCA fitness instructor.
A lawsuit against the hospital ended in a settlement. Davis also sued the obstetrician, but a jury ruled in the doctor's favor.
The child born that day, Ethan, starts second grade next week. "He's a happy kid," Davis said. "He's just never had a mom.
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MOTTO TO LIVE BY:
"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, chocolate in one hand, champagne in the other, body thoroughly used up, totally worn out and screaming.
WOO HOO!!, what a ride!!!"
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Then you throw in all the new alternative child birth methods:
up-side-down or whatever else is new in California, and it would be no surprise that the rate is getting higher.